Cutting-tool.



C. BACH, 1n,-

CUTUNG TOOL.

APPucArloN man MAY 3.1916.

Patented J un@ 25, 1918.

CHRISTOPHER BACH, JR., OF MILWAUKEE, WISCONSIN.

CUTTING-TOOL.

Specification of Letters Patent.

Patented J une 25, 1918.

Application led May 3, 1916. serial No. 95,029

To all whom it may coyfcern Be itlknown that I, CnRrsToPHER BACI?, Jr., a citizen of the Unived States, and resp dent of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Cutting-Tools; and l do hereby declare that the following is a full, clear, and exact description thereof.

The present invention relates to new and useful improvements in tools for cutting circular openings in Work material and re latesinore particularly to that type of cuttin tool wherein the cutter head is rota* tab e with respect to the work nlaterial.

Under 4various circumstances it is often necessary to provide circular openingsl in various articles under such conditions as to render the use of conventional lathes or other cutting machines impractical.

It is therefore the object of the present invention to provide a tool for cutting circular openings in material which is ofsuch compact and portable nature that it may bc carried about readily in a Work kit.

It is further an object to provide such a portable or as it may be termed, emergency tool, which is capable ot' ready operation, and in this connection .it is more specifically an object to provide a cutting tool of this nature which may be securely fastened to the work material and which may be actuated in its cutting operation by rotating the cutter head, as by a wrench.

A still further object resides in the provision, in a sweep cutting tool, of a spring feed forthe cutter head, whereby it is automatically fed in a most simple manner during the cutting operation, and further whereby a too rapid feeding with respect to the1 hardness of material, is obviated,l `to thus prevent possible breakage of the knife members.

It'is still further an object to provide such a tool which is of a relatively simple and compact structure to promote dura bility in use and convenience in manipula tion. v

Vith the above and other` objects and advantages in View the invention residesI more particularly in the novel combination, arrangement and formation of parts more particularly hereinafter described and more particularly pointed out in the appended ('lllf.

In the drawings:

Figure 1 is a side elevational view of a cutting tool constructed in accordance with the present invention, with portions thereof broken away to more clearly disclose the structure.

Fig. 2 is a transverse sectional view through the tool on the line 2 2 of Fig. l.

Fig. f3 is an elevational view of a modified form of the invention more particularly adapted for cutting soft material such as fiber boa rd.

l l is :l t'ransverse sectional view through this modified structure on the line M4 of Fig. 3.

Fig. 5 is a detail horizontal sectional view through the upper end of Fig. 1, showing the means for preventing relative rotation .of the spring engaging washer of the shaft.

Referring now mre particularly to Figs. l and 2 of the drawings, the improved tool comprises a bodyshaft 5 which is adapted for securement to a sheet of Work material 6 by a reduced threaded extension T ai: one end passed through an opening 8 formed in the work material and. having threaded thereon a nut 9 provided at its inner end with a peripheral .llange 10 seating the work material. Thus the Wdrk material is clamped between the shoulder formed at. the inner end of the reduced shaft extension and the nut, andthe body shaft is; fixedly secured to the work material. Slidable on this body shaft is a cutter head includingr a sleeve 11 intermediately provided with oppositely extending lateral arms l2 which areprovided at opposite sides with flanges i3 e tendingtoward the attaching end of the bb'i y shaft, and provided with longitudinal'slots 14. iSlidably passed through these slots,- are holdingr bolts 1,5 having head porions disposed at the inner sides of the flanges and apertured to receive the knife `bars 16. the ends of thebolts outwardly of the flanges being threaded for the reception of clamping 1nutsli? whereby the knife barsnnav be clamped against the inner faces of th(` flanges.

Slidably mounted on the end of the body shaft farthest from the cutter head by reason of a longitudinal flattening of one side of the shaft is a washer 18, and disposed be tween the washer and the cutter head sleeve is an expansile spring:- lll which vgg held under desired tension by an e Jjustwg at 20 threaded on the just speciied end of the shaft to bear against the washer 18. Thus the cutter head (is resilicntly urged to operative engagement with the work material, and the spring comprises a means for feeding the cutter head into the material as the cutting operation proceeds.- For rotating the cutter head, the inner portion of the sleeve 11 is provided with a plurality of iiat faces 21 engageable by a vWrench or other tool.

It is noted that the knife bars 16 engage u ainst the bottomfaces of the arms 12, and t ius a firm seating of the knife-bars is pro cured. To rovide a positive means for holding the linife bars in definite position relative to the axis of the tool, a gage-plate 22 is detachably secured on the inner end of the cutter head sleeve, as by means of the screws 23, the body shaft passing through this plate, and each side of the plate is provided with arms 24 extending parallel to the arms 12 of the sleeve an ada ted to rest against the iianges 13 of sai Y arms. Each of the arms is provided with series of side projections 25 which are adapted to project inwardly of a supporting flange when disposed there-adjace t to define receiving recesses for the knife ars, the projections being preferably spaced in such manner as to provide for cutting-openings of such sizes as pipes. The projections of oppositply disposed arms 24 are arranged intaggered relation whereby upon turnin ,i the gage vplate on the sleeve to selective y position certain arms adjacent to the [langes 22, a relatively fine degree of adjustment may be procure In the operation of thepresent machine, the hole 8 which receives the reduced exten- Sion of the body shaft is formed in the work material as by a brace and bit. The shaft is then secured to the work material by inportion of *its reduced end in this opening, the cutter head is then positioned en the body Shaft and the feed screw is positioned on the shaftand placed under such tension by the nut 20` as to rovide for a proper feeding engagement o the cutter head with the Work material. The cutter head is then rotated and inasmuch as the entire lool is attached to the work-material, the operation to receive standard size vided a body shaft 2G which is roviueu at one end with a spur 27 adaptl to engage in the work material to hold the shaft oen4 tered with respect to the operation of the cutting member; the otheiend of the shaft is provided with a plurality of Square faces 28 and adapted for association with a brace tool or other rotating means. Slidable on the shaftis a sleeve 29 enlarged at one end to .form a cutter head 3Q The outer face of this head is provided 'with a transverse groove 31 disposed laterally of the axis of the shaft and intersecting the shaft, which has its side cut away as at 32. Disposed in this groove and -eXtended across the cutaway portion of the shaft is a transverse shank '33 of knife bar, which is laterally directed at one end at 34 to form the knife.

This shank is adjustably secured in thev roove by va bolt 35 t rough the head 30. substantiall splined on the body shaft by the above escribed arrangement and thus lupon rotation of the body shaft, the cutter head will be rotated and is urged to operar tive cutting engagement with the workmaterial bya sprmg 36 dis osed onthe shaft between the sleeve 27 an an adjustingnut 37 threaded on the shaft.

While the present invention has been more particularly described as embodied in a portable cutting tool, it will be appreciated that various features of the invention may find valuable application in cutting mechanisms not necessarily of ortable type and l am therefore to be limite in the scope of my invention, only by the appended claims.

A general advantage of the present in vention which is not necessarily associated with the portable embodiment of the tool is assed transversely he cutter head 1s the spring feed arrangement for the cutter head, whereby an exceedingly simple automatic feed is procured and further whereby a yielding ,feed is procured to permit the knife bars to yield uponl encountering relatively hard portions of the Work material, to thus prevent breakage of the knife bars. I claim: 4 y l 1. A cutting tool comprisin a body shaft,

a cutter head carried there y and longitudinally movable thereon, an expansile spring on the bod 'shaft and engaglng the cutter head, an a instable holding member for the spring carried by the shaft and meansfor revolving the cutter head. y

2. A cuttin tool comprisin ay shaft, means or securing said go to work material, acutter head rotatably carried by the body shaft and havin longitudinal movement thereon and a fee spring carried by the bod shaft and engageable with the cutter hea ing the cutter head.

dy shafl.

, and means for revolv- 3. A cutting tool comprising a body shaft, a cutter head rotatably carried by the shaft and havingdongitudinal movement thereon, a reduced extension on one end ofthe shaft, a clamping nut threaded -n said reduced extension, a feed spring carried by the shaft and engageable with the cutter head at its end farthest from the said reduced extonsion of the shaft, and means for rotating the cutter head.

4. A cutting tool comprising a body shaft, a Cutter head rotatablyfmounted thereon and having longitudinal movement with respect thereto, means at one end of the shaft for securing it to work material, a washer slidable on the other end of the shaft, means for preventing relative rotation ot' the washer, an expansile spring disposed be tween the washer and the cutter head, and a nut threaded on the shaft to engage said Washer.

5. A cutting tool comprisin a body shaft, means at one end of said shat for securing it to Work material, a cutter head including a sleeve rotatably mounted on the shaft and having longitudinal movement thereon, op

positely extending arms projecting from the sleeve, flanges projecting from the arms to- Ward the specified end of the body shaft, apertured holding bolts passed through the flanges, to'ol bars passed through the apertures of. the holding bars to engage against the said arms, and a feed .spring carried by the body shaft and engageahle with the cutter head.

6. A cutting tool comprising a body shaft, means at one end of said shaft for securing it to work material; a cutter head includ ing a sleeve rotatably mounted on the shaft and having longitudinal movement thereon, oppositely extending arms projecting from the sleeve, flanges projecting from the arms toward the specified endof the body shaft, apertured holding bolts slidably passed through the flanges, a gage plate reversihly secured on the end ol' the sleeve adjacent the flanges, pairs of spaced arms at the ends of the plate adapted t0 be selectively posiA tioned in alinemeit with the! flanges, probars selectively disposed in certain recessesjections atfthe inner sides oil the arms of the plate defining tool bar recesses and tool and passed through the apertures' of the holding bolts to engage against `the first named arms and a `eedspring Aairried by the body shaft and engageable with. the cutter head. i

7. A cutting tool comprising a shaft having a threaded end, a cutting member longitudnall Slidable and rotatable on the shaft, a shoul er on the threaded end of the shaft, and a nut threaded on said end of the shaft for clamping work material between said nut and the shoulder.

8. ,A cutting tool comprising a body shaft, a rotatable eutter head including a sleeve longitudinally sldable on the shaft, an arm extending laterally from the sleeve, a flange extending from the sleeve, a tool holding member carried by the flange, a tool in Said holding member and disposed below the arm for engagement` with the under side thereof, whereby to limit movement of said tool in one direction, and means for rotating the cutter head. Y

l). A cutting` lool ycomprising a body shaft, a rotatable cutter head including a Sleeve longitudinally slidable on the shaft, an arm extending laterally from the sleeve, a flange extending `lroln the sleeve and having an elongated slot therein, a tool holding member disposed in the slot and adjustably carried b v the flange, 'a tool in said holding member and disposed below the arm for en gagcinent with the under side thereof, whereby to limit movement of said tool in one direetion, and means for rotating the eutter head,

1U. A cutting tool comprising a body shaft, a rotatable cutter head including a sleeve longitudinally slidable on the shaft, a flange extending laterally from the sleeve, a tool holding member adjust-ably carried hy the flange, a gage plate secured to the sleeve adjacent the flange and having a lurality of tool receiving recesses adapte to have the tool holding member selectively alined therewith, and a tool earriedby the holdinf.;r member and disposed in anyone of said recesses.l

ll. A cutting tool comprising a body shaft, a rotatable cutter head including a sleeve longitudinally slidable on the shaft, a flange extending laterally from the sleeve, a tool holding member adjustably carried by the flange, a gage plate reversibly se- 'enred to the sleeve, a pair of spaced arms extending` from the gage plate and adapted to be selectively engaged with said ange, each of said arms having a plurality of tool receiving `reressee, said recesses being .adapted to have the tool holding `member selectively alined therewith, and e tool earried by the `holding member and disposed in any `one of said recesses in either arm of the gage plate.

In testimony that I claim the foregoing l have hereunto set my hand at Milwaukee, in the county of Milwaukee and State of Wisconsin, in thev resence of two witnesses.

CHRI TOPHER BACH, JR. Witnesses:

Geenen W. YOUNG,

M. E. DOWNEY,

dfi 

